misc: initial working setup for metrics observabilit

backend/src/lib/telemetry/instrumentation.ts

@@ -0,0 +1,37 @@
+import opentelemetry from "@opentelemetry/api";
+import { getNodeAutoInstrumentations } from "@opentelemetry/auto-instrumentations-node";
+import { OTLPMetricExporter } from "@opentelemetry/exporter-metrics-otlp-proto";
+import { registerInstrumentations } from "@opentelemetry/instrumentation";
+import { Resource } from "@opentelemetry/resources";
+import { AggregationTemporality, MeterProvider, PeriodicExportingMetricReader } from "@opentelemetry/sdk-metrics";
+import { SEMRESATTRS_SERVICE_NAME, SEMRESATTRS_SERVICE_VERSION } from "@opentelemetry/semantic-conventions";
+
+export const initTelemetry = (exportURL: string) => {
+  const resource = Resource.default().merge(
+    new Resource({
+      [SEMRESATTRS_SERVICE_NAME]: "infisical-server",
+      [SEMRESATTRS_SERVICE_VERSION]: "0.1.0"
+    })
+  );
+
+  const metricExporter = new OTLPMetricExporter({
+    url: `${exportURL}/v1/metrics`,
+    temporalityPreference: AggregationTemporality.DELTA
+  });
+
+  const metricReader = new PeriodicExportingMetricReader({
+    exporter: metricExporter,
+    exportIntervalMillis: 30000
+  });
+
+  const myServiceMeterProvider = new MeterProvider({
+    resource,
+    readers: [metricReader]
+  });
+
+  opentelemetry.metrics.setGlobalMeterProvider(myServiceMeterProvider);
+
+  registerInstrumentations({
+    instrumentations: [getNodeAutoInstrumentations()]
+  });
+};